221461636 has 12 divisors (see below), whose sum is σ = 422790480. Its totient is φ = 100664360.

The previous prime is 221461631. The next prime is 221461651. The reversal of 221461636 is 636164122.

221461636 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221461598 and 221461607.

It is not an unprimeable number, because it can be changed into a prime (221461631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2516566 + ... + 2516653.

It is an arithmetic number, because the mean of its divisors is an integer number (35232540).

Almost surely, 2^221461636 is an apocalyptic number.

It is an amenable number.

221461636 is a deficient number, since it is larger than the sum of its proper divisors (201328844).

221461636 is a wasteful number, since it uses less digits than its factorization.

221461636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5033234 (or 5033232 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 221461636 is about 14881.5871465378. The cubic root of 221461636 is about 605.0150359399.

The spelling of 221461636 in words is "two hundred twenty-one million, four hundred sixty-one thousand, six hundred thirty-six".